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If "^(2n+1)P(n-1):^(2n-1)P(n)=11:21,then...

If `"^(2n+1)P_(n-1):^(2n-1)P_(n)=11:21`,then `n^(2)+n+15` is equal to :

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JEE MAINS PREVIOUS YEAR-JEE MAINS 2023 JAN ACTUAL PAPER-Question
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